Southern California -- this just in

[Updated at 10:30 p.m. A tense day in the immigrant Los Angeles neighborhood of Westlake, where police shot and killed a day laborer, ended without injuries or arrests, officials said Monday night.]

Police in riot gear stood guard Monday as dozens of people gathered near a Westlake shopping center to protest the fatal shooting of a day laborer by police.

Using bullhorns as they chanted “assassination, assassination!” the protesters at one point got into a shouting-and-shoving match with a store security guard, who fled to his car and sped away as protesters hurled objects and kicked at his vehicle.

The angry protesters gathered at the site of Sunday’s shooting in which Los Angeles police officers shot and killed a man in a bustling shopping district at 6th Street and Union Avenue.

Police said the man was armed with a knife and that officers had been flagged down by a pedestrian who alerted them to a man with a knife.

The protesters who gathered Monday, however, said the man was unarmed and had been killed for no reason. Police have not formally identified the man, but friends identified him as Manuel Jamines, a day laborer from Guatemala.

The protesters erected a makeshift memorial at the site of the shooting with photos of the day laborer and signs reading “We want justice” and “Police are to serve and protect, not murder the innocent.”

No arrests were made and police in riot gear stood lined up in a parking lot as the protest continued.

“This investigation is going to be transparent,” said LAPD Capt. Rigo Romero. “We take every force investigation very, very seriously.”